还是之前的那个问题，同样的uboot固件，在BBB上是可以保存环境变量的，但是在我自己核心板上面不能保存环境变量

两个板子是从同一个sd卡上启动的，一个可以，一个不可以，什么原因呢

由于之前的帖子您没有给出反馈，我们需要一些时间继续跟进您的帖子。

你可以尝试一下在<Processor SDK>/board-support/u-boot-<version>/include/configs/am335x_evm.h的最开始添加#define DEBUG ,然后执行saveev命令并且把log文件贴出来看一下。

=> saveenv
Saving Environment to FAT... EXPORT table = 9ffd0aec, htab.size = 521, htab.filled = 116, size = 131068
Unsorted: n=116
0: 9df3b7b4 ==> ramargs => setenv bootargs console=${console} ${optargs} root=${ramroot} rootfstype=${ramrootfstype}
1: 9df3b7f0 ==> bootdir => /boot
2: 9df3b804 ==> ramrootfstype => ext2
3: 9df3b82c ==> boot_prefixes => / /boot/
4: 9df3b840 ==> scan_dev_for_efi => setenv efi_fdtfile ${fdtfile}; if test -z "${fdtfile}" -a -n "${soc}"; then setenv efi_fdtfile ${soc}-${board}${boardver}.dtb; fi; for prefix in ${efi_dtb_prefixes}; do if test -e ${devtype} ${devnum}:${distro_bootpart} ${prefix}${efi_fdtfile}; then run load_efi_dtb; fi;done;if test -e ${devtype} ${devnum}:${distro_bootpart} efi/boot/bootarm.efi; then echo Found EFI removable media binary efi/boot/bootarm.efi; run boot_efi_binary; echo EFI LOAD FAILED: continuing...; fi; setenv efi_fdtfile
5: 9df3b854 ==> bootm_size => 0x10000000
6: 9df3b868 ==> nandboot => echo Booting from nand ...; run nandargs; nand read ${fdtaddr} NAND.u-boot-spl-os; nand read ${loadaddr} NAND.kernel; bootz ${loadaddr} - ${fdtaddr}
7: 9df3b890 ==> boot_scripts => boot.scr.uimg boot.scr
8: 9df3b958 ==> boot_fit => 0
9: 9df3b9f8 ==> loadbootscript => load mmc ${mmcdev} ${loadaddr} boot.scr
10: 9df3ba20 ==> ver => U-Boot 2019.01-g7a49b7b85e-dirty (Aug 08 2019 - 16:45:51 +0800)
11: 9df3ba48 ==> findfdt => if test $board_name = A335BONE; then setenv fdtfile am335x-bone.dtb; fi; if test $board_name = A335BNLT; then setenv fdtfile am335x-boneblack.dtb; fi; if test $board_name = A335PBGL; then setenv fdtfile am335x-pocketbeagle.dtb; fi; if test $board_name = BBBW; then setenv fdtfile am335x-boneblack-wireless.dtb; fi; if test $board_name = BBG1; then setenv fdtfile am335x-bonegreen.dtb; fi; if test $board_name = BBGW; then setenv fdtfile am335x-bonegreen-wireless.dtb; fi; if test $board_name = BBBL; then setenv fdtfile am335x-boneblue.dtb; fi; if test $board_name = BBEN; then setenv fdtfile am335x-sancloud-bbe.dtb; fi; if test $board_name = A33515BB; then setenv fdtfile am335x-evm.dtb; fi; if test $board_name = A335X_SK; then setenv fdtfile am335x-evmsk.dtb; fi; if test $board_name = A335_ICE && test $ice_mii = rmii; then setenv fdtfile am335x-icev2.dtb; fi; if test $board_name = A335_ICE && test $ice_mii = mii; then setenv fdtfile am335x-icev2-prueth.dtb; fi; if test $fdtfile = undefined; then echo 12: 9df3ba98 ==> loadramdisk => load mmc ${mmcdev} ${rdaddr} ramdisk.gz
13: 9df3bb4c ==> netloadimage => tftp ${loadaddr} ${bootfile}
14: 9df3bc14 ==> arch => arm
15: 9df3bc28 ==> run_fit => bootm ${fit_loadaddr}#${fdtfile}${overlaystring}
16: 9df3bcc8 ==> boot_syslinux_conf => extlinux/extlinux.conf
17: 9df3bd18 ==> mmcdev => 0
18: 9df3be44 ==> fdtcontroladdr => 9df298d8
19: 9df3be80 ==> serial# => FCNO.0000001
20: 9df3bed0 ==> board_name => AM3352FC
21: 9df3bee4 ==> pxefile_addr_r => 0x80100000
22: 9df3bf5c ==> bootcmd_dhcp => run boot_net_usb_start; if dhcp ${scriptaddr} ${boot_script_dhcp}; then source ${scriptaddr}; fi;setenv efi_fdtfile ${fdtfile}; if test -z "${fdtfile}" -a -n "${soc}"; then setenv efi_fdtfile ${soc}-${board}${boardver}.dtb; fi; setenv efi_old_vci ${bootp_vci};setenv efi_old_arch ${bootp_arch};setenv bootp_vci PXEClient:Arch:00010:UNDI:003000;setenv bootp_arch 0xa;if dhcp ${kernel_addr_r}; then tftpboot ${fdt_addr_r} dtb/${efi_fdtfile};if fdt addr ${fdt_addr_r}; then bootefi ${kernel_addr_r} ${fdt_addr_r}; else bootefi ${kernel_addr_r} ${fdtcontroladdr};fi;fi;setenv bootp_vci ${efi_old_vci};setenv bootp_arch ${efi_old_arch};setenv efi_fdtfile;setenv efi_old_arch;setenv efi_old_vci;
23: 9df3bf70 ==> bootcmd_legacy_mmc0 => setenv mmcdev 0; setenv bootpart 0:2 ; run mmcboot
24: 9df3bfd4 ==> eth1addr => 4c:3f:d3:3b:38:cd
25: 9df3c038 ==> ramroot => /dev/ram0 rw
26: 9df3c04c ==> importbootenv => echo Importing environment from mmc${mmcdev} ...; env import -t ${loadaddr} ${filesize}
27: 9df3c074 ==> scriptaddr => 0x80000000
28: 9df3c088 ==> envboot => mmc dev ${mmcdev}; if mmc rescan; then echo SD/MMC found on device ${mmcdev};if run loadbootscript; then run bootscript;else if run loadbootenv; then echo Loaded env from ${bootenvfile};run importbootenv;fi;if test -n $uenvcmd; then echo Running uenvcmd ...;run uenvcmd;fi;fi;fi;
29: 9df3c100 ==> boot_a_script => load ${devtype} ${devnum}:${distro_bootpart} ${scriptaddr} ${prefix}${script}; source ${scriptaddr}
30: 9df3c114 ==> dfu_alt_info_ram => kernel ram 0x80200000 0x4000000;fdt ram 0x80f80000 0x80000;ramdisk ram 0x81000000 0x4000000
31: 9df3c18c ==> ethaddr => 4c:3f:d3:3b:38:cb
32: 9df3c1dc ==> fdt_addr_r => 0x88000000
33: 9df3c290 ==> finduuid => part uuid mmc ${bootpart} uuid
34: 9df3c358 ==> bootscript => echo Running bootscript from mmc${mmcdev} ...; source ${loadaddr}
35: 9df3c380 ==> boot_fdt => try
36: 9df3c394 ==> nandargs => setenv bootargs console=${console} ${optargs} root=${nandroot} rootfstype=${nandrootfstype}
37: 9df3c3f8 ==> baudrate => 115200
38: 9df3c45c ==> boot_extlinux => sysboot ${devtype} ${devnum}:${distro_bootpart} any ${scriptaddr} ${prefix}${boot_syslinux_conf}
39: 9df3c59c ==> nandrootfstype => ubifs rootwait=1
40: 9df3c6c8 ==> dfu_alt_info_emmc => rawemmc raw 0 3751936;boot part 1 1;rootfs part 1 2;MLO fat 1 1;MLO.raw raw 0x100 0x200;u-boot.img.raw raw 0x300 0x1000;u-env.raw raw 0x1300 0x200;spl-os-args.raw raw 0x1500 0x200;spl-os-image.raw raw 0x1700 0x6900;spl-os-args fat 1 1;spl-os-image fat 1 1;u-boot.img fat 1 1;uEnv.txt fat 1 1
41: 9df3c718 ==> usb_boot => usb start; if usb dev ${devnum}; then setenv devtype usb; run scan_dev_for_boot_part; fi
42: 9df3c790 ==> bootcmd_mmc1 => setenv devnum 1; run mmc_boot
43: 9df3c81c ==> bootcmd => if test ${boot_fit} -eq 1; then run update_to_fit; fi; run findfdt; run init_console; run envboot; run distro_bootcmd
44: 9df3c880 ==> kernel_addr_r => 0x82000000
45: 9df3c8d0 ==> ramboot => echo Booting from ramdisk ...; run ramargs; bootz ${loadaddr} ${rdaddr} ${fdtaddr}
46: 9df3ca24 ==> mmcrootfstype => ext4 rootwait
47: 9df3cad8 ==> get_overlaystring => for overlay in $overlay_files;do;setenv overlaystring ${overlaystring}'#'${overlay};done;
48: 9df3cb00 ==> fit_loadaddr => 0x90000000
49: 9df3cb3c ==> bootfile => zImage
50: 9df3cb64 ==> netloadfdt => tftp ${fdtaddr} ${fdtfile}
51: 9df3cb8c ==> mtdids => nand0=nand.0
52: 9df3cbc8 ==> board => am335x
53: 9df3cbf0 ==> spiargs => setenv bootargs console=${console} ${optargs} root=${spiroot} rootfstype=${spirootfstype}
54: 9df3cc18 ==> stderr => serial@44e09000
55: 9df3cc2c ==> bootenvfile => uEnv.txt
56: 9df3cc40 ==> spirootfstype => jffs2
57: 9df3cc54 ==> distro_bootcmd => for target in ${boot_targets}; do run bootcmd_${target}; done
58: 9df3cd1c ==> fdtfile => undefined
59: 9df3ce48 ==> netargs => setenv bootargs console=${console} ${optargs} root=/dev/nfs nfsroot=${serverip}:${rootpath},${nfsopts} rw ip=dhcp
60: 9df3cefc ==> loadaddr => 0x82000000
61: 9df3cf24 ==> boot_efi_binary => if fdt addr ${fdt_addr_r}; then bootefi bootmgr ${fdt_addr_r};else bootefi bootmgr ${fdtcontroladdr};fi;load ${devtype} ${devnum}:${distro_bootpart} ${kernel_addr_r} efi/boot/bootarm.efi; if fdt addr ${fdt_addr_r}; then bootefi ${kernel_addr_r} ${fdt_addr_r};else bootefi ${kernel_addr_r} ${fdtcontroladdr};fi
62: 9df3cf4c ==> usbnet_devaddr => de:ad:be:ef:00:01
63: 9df3cfb0 ==> bootcmd_legacy_mmc1 => setenv mmcdev 1; setenv bootpart 1:2 ; run mmcboot
64: 9df3d064 ==> rdaddr => 0x88080000
65: 9df3d078 ==> bootdelay => 2
66: 9df3d08c ==> dfu_alt_info_mmc => boot part 0 1;rootfs part 0 2;MLO fat 0 1;MLO.raw raw 0x100 0x200;u-boot.img.raw raw 0x300 0x1000;u-env.raw raw 0x1300 0x200;spl-os-args.raw raw 0x1500 0x200;spl-os-image.raw raw 0x1700 0x6900;spl-os-args fat 0 1;spl-os-image fat 0 1;u-boot.img fat 0 1;uEnv.txt fat 0 1
67: 9df3d12c ==> spiimgsize => 0x362000
68: 9df3d154 ==> rootpath => /export/rootfs
69: 9df3d1a4 ==> loadimage => load ${devtype} ${bootpart} ${loadaddr} ${bootdir}/${bootfile}
70: 9df3d1b8 ==> nandroot => ubi0:rootfs rw ubi.mtd=NAND.file-system,2048
71: 9df3d21c ==> fdtaddr => 0x88000000
72: 9df3d244 ==> mtdparts => mtdparts=nand.0:128k(NAND.SPL),128k(NAND.SPL.backup1),128k(NAND.SPL.backup2),128k(NAND.SPL.backup3),256k(NAND.u-boot-spl-os),1m(NAND.u-boot),128k(NAND.u-boot-env),128k(NAND.u-boot-env.backup1),8m(NAND.kernel),-(NAND.file-system)
73: 9df3d2d0 ==> nfsopts => nolock
74: 9df3d2f8 ==> mmc_boot => if mmc dev ${devnum}; then setenv devtype mmc; run scan_dev_for_boot_part; fi
75: 9df3d3fc ==> stdin => serial@44e09000
76: 9df3d410 ==> cpu => armv7
77: 9df3d424 ==> partitions => uuid_disk=${uuid_gpt_disk};name=bootloader,start=384K,size=1792K,uuid=${uuid_gpt_bootloader};name=rootfs,start=2688K,size=-,uuid=${uuid_gpt_rootfs}
78: 9df3d438 ==> init_console => if test $board_name = A335_ICE; then setenv console ttyO3,115200n8;else setenv console ttyO0,115200n8;fi;
79: 9df3d474 ==> spiroot => /dev/mtdblock4 rw
80: 9df3d488 ==> stdout => serial@44e09000
81: 9df3d49c ==> vendor => ti
82: 9df3d4d8 ==> efi_dtb_prefixes => / /dtb/ /dtb/current/
83: 9df3d53c ==> loadfdt => load ${devtype} ${bootpart} ${fdtaddr} ${bootdir}/${fdtfile}
84: 9df3d578 ==> board_serial => FCNO.0000001
85: 9df3d5a0 ==> ramdisk_addr_r => 0x88080000
86: 9df3d5f0 ==> boot_targets => mmc0 legacy_mmc0 mmc1 legacy_mmc1 nand0 pxe dhcp
87: 9df3d6e0 ==> boot_net_usb_start => usb start
88: 9df3d71c ==> update_to_fit => setenv loadaddr ${fit_loadaddr}; setenv bootfile ${fit_bootfile}
89: 9df3d780 ==> board_rev => FCV1
90: 9df3d7d0 ==> bootcmd_nand => run nandboot
91: 9df3d7e4 ==> bootcmd_mmc0 => setenv devnum 0; run mmc_boot
92: 9df3d7f8 ==> ice_mii => mii
93: 9df3d8e8 ==> spisrcaddr => 0xe0000
94: 9df3d94c ==> spibusno => 0
95: 9df3d9b0 ==> loadfit => run args_mmc; run run_fit;
96: 9df3da28 ==> console => ttyO0,115200n8
97: 9df3da50 ==> dfu_alt_info_nand => SPL part 0 1;SPL.backup1 part 0 2;SPL.backup2 part 0 3;SPL.backup3 part 0 4;u-boot part 0 5;u-boot-spl-os part 0 6;kernel part 0 8;rootfs part 0 9
98: 9df3da64 ==> soc => am33xx
99: 9df3daf0 ==> mmcboot => mmc dev ${mmcdev}; setenv devnum ${mmcdev}; setenv devtype mmc; if mmc rescan; then echo SD/MMC found on device ${mmcdev};if run loadimage; then if test ${boot_fit} -eq 1; then run loadfit; else run mmcloados;fi;fi;fi;
100: 9df3db68 ==> static_ip => ${ipaddr}:${serverip}:${gatewayip}:${netmask}:${hostname}::off
101: 9df3dbcc ==> fit_bootfile => fitImage
102: 9df3dc08 ==> bootpart => 0:2
103: 9df3dc44 ==> scan_dev_for_boot_part => part list ${devtype} ${devnum} -bootable devplist; env exists devplist || setenv devplist 1; for distro_bootpart in ${devplist}; do if fstype ${devtype} ${devnum}:${distro_bootpart} bootfstype; then run scan_dev_for_boot; fi; done
104: 9df3dd0c ==> spiboot => echo Booting from spi ...; run spiargs; sf probe ${spibusno}:0; sf read ${loadaddr} ${spisrcaddr} ${spiimgsize}; bootz ${loadaddr}
105: 9df3dd34 ==> scan_dev_for_boot => echo Scanning ${devtype} ${devnum}:${distro_bootpart}...; for prefix in ${boot_prefixes}; do run scan_dev_for_extlinux; run scan_dev_for_scripts; done;run scan_dev_for_efi;
106: 9df3dd5c ==> loadbootenv => fatload mmc ${mmcdev} ${loadaddr} ${bootenvfile}
107: 9df3dd70 ==> load_efi_dtb => load ${devtype} ${devnum}:${distro_bootpart} ${fdt_addr_r} ${prefix}${efi_fdtfile}
108: 9df3de24 ==> scan_dev_for_scripts => for script in ${boot_scripts}; do if test -e ${devtype} ${devnum}:${distro_bootpart} ${prefix}${script}; then echo Found U-Boot script ${prefix}${script}; run boot_a_script; echo SCRIPT FAILED: continuing...; fi; done
109: 9df3dec4 ==> boot_script_dhcp => boot.scr.uimg
110: 9df3deec ==> mmcloados => run args_mmc; if test ${boot_fdt} = yes || test ${boot_fdt} = try; then if run loadfdt; then bootz ${loadaddr} - ${fdtaddr}; else if test ${boot_fdt} = try; then bootz; else echo WARN: Cannot load the DT; fi; fi; else bootz; fi;
111: 9df3df14 ==> scan_dev_for_extlinux => if test -e ${devtype} ${devnum}:${distro_bootpart} ${prefix}${boot_syslinux_conf}; then echo Found ${prefix}${boot_syslinux_conf}; run boot_extlinux; echo SCRIPT FAILED: continuing...; fi
112: 9df3df64 ==> netboot => echo Booting from network ...; setenv autoload no; dhcp; run netloadimage; run netloadfdt; run netargs; bootz ${loadaddr} - ${fdtaddr}
113: 9df3dfc8 ==> bootcount => 1
114: 9df3dff0 ==> bootcmd_pxe => run boot_net_usb_start; dhcp; if pxe get; then pxe boot; fi
115: 9df3e004 ==> args_mmc => run finduuid;setenv bootargs console=${console} ${optargs} root=PARTUUID=${uuid} rw rootfstype=${mmcrootfstype}
blk_get_devnum_by_typename: if_type=6, devnum=0: mmc@48060000.blk, 6, 0
uclass_find_device_by_seq: 0 -1
uclass_find_device_by_seq: 0 0
- -1 -1 'mmc@48060000.blk'
- not found
mmc_blk_probe: mmc_init() failed (err=-123)
get_dev_hwpart: No device for iface 'mmc', dev 0
** Bad device mmc 0 **
Failed (1)
Command failed, result=1

已经贴出来了，您看下

** Bad device mmc 0 **这里有问题，mmc0是sd卡，是从sd卡的fat32分区去读的MLO文件，那怎么还能有问题呢

出现的一些错误信息：

刚刚测试了下，貌似mmc相关的命令都不能执行，对了，我使用的是3354

这是mmc初始化的时候：

这些命令都无法执行吗？如果可以的话，贴出来看一下。
=> mmc list
=> mmc dev 0
=> mmc part
=> mmc info
=> mmc dev 1
=> mmc part
=> mmc info
=> mmc rescan
=> mmc list
=> mmc dev 0
=> mmc dev 1

是这样，目前已经大概知道问题所在了，由于板子硬件mmc0接口中cd引脚和evm不同导致的，现在已经可以保存了，但是重启后uboot提示成功读取已经保存的环境变量，但环境变量的值是默认的而不是uEnv里面保存的，单独使用文本查看环境变量确实已经成功保存了，这一般什么问题呢？